package top.hekun.study.controller;


import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")  // 接口路径 ws://localhost:8087/webSocket/userId;
public class WebSocketController {
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    private static CopyOnWriteArraySet<WebSocketController> webSockets = new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<String, Session>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    private String userId;
    private ProcessBuilder processBuilder;
    private Process process;
    private BufferedReader reader;
    private Thread thread;
    private BufferedWriter writer;
    private Boolean b = true;

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            webSockets.add(this);
            sessionPool.put(userId, session);
            log.info("【websocket消息】有新的连接，总数为:" + webSockets.size());
            log.info("this:" + this);
            processBuilder = new ProcessBuilder("cmd.exe")
                    // 合并
                    .redirectErrorStream(true);
            process = processBuilder.start();
            InputStreamReader inputStreamReader = new InputStreamReader(process.getInputStream(), "GBK");
            reader = new BufferedReader(inputStreamReader);
            writer = new BufferedWriter(new OutputStreamWriter(process.getOutputStream(), "GBK"));
            thread = new Thread("* ") {
                @Override
                public void run() {
                    int read;
                    char[] chars = new char[1024];
                    while (b) {
                        try {
                            if ((read = reader.read(chars)) == -1) {
                                break;
                            }
                        } catch (IOException e) {
                            throw new RuntimeException(e);
                        }
                        sendOneMessage(session, new String(chars, 0, read));
                    }
                    System.out.println("线程 关闭");
                }
            };
            thread.start();
        } catch (Exception e) {
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】连接断开，总数为:" + webSockets.size());
            b = false;
            inp("");
//            thread.stop();
            reader.close();
            writer.close();
            process.destroy();
            Thread.sleep(5000);
        } catch (Exception e) {
        }
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     * @param session
     */
    @OnMessage
    public void onMessage(String message, Session session) throws IOException {
        log.info("【websocket消息】收到客户端消息:" + message);
        sendOneMessage(session, "发送: " + message);
        inp(message);


    }

    /**
     * 发送错误时的处理
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:" + error.getMessage());
        error.printStackTrace();
    }


    // 此为广播消息
    public void sendAllMessage(String message) {
        log.info("【websocket消息】广播消息:" + message);
        for (WebSocketController webSocket : webSockets) {
            try {
                if (webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public void sendOneMessage(String userId, String message) {
        Session session = sessionPool.get(userId);
        sendOneMessage(session, message);
    }

    public void sendOneMessage(Session session, String message) {
        if (session != null && session.isOpen()) {
            try {
                log.info("【websocket消息】 单点消息:" + message);
                session.getAsyncRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息(多人)
    public void sendMoreMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            Session session = sessionPool.get(userId);
            if (session != null && session.isOpen()) {
                try {
                    log.info("【websocket消息】 单点消息:" + message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

    }

    private void inp(String s) throws IOException {
        // 写入命令
        writer.write(s);
        // 换行
        writer.newLine();
        // 刷新
        writer.flush();


    }
}
